Merge Graph

Right-click on a graph and select Merge
Graph from the shortcut menu to display the Select
Graph to Merge dialog box, where you can browse to the graph that
you want to merge with the current graph.

Note: Categorized
graphs cannot be merged. Categorization is an equivalence relation in
a data set. Category graph design assumes a single relation. A single
relation means a single data set. Two category graphs generally correspond
to different data sets; even if the data set is common, the relations
may be different.